Phonograph record resurfacing machine



G. H. FRITZINGER PHONOGRAPH RECORD RESURFACING; MACHINE Filed" 1938' 3, Sheets-s 1 l 1 L18: 7 INVENTOR g -NJ; BY

izz g' ORNEY July 30, 1940. s. H. FRITZINGER PHONOGRAPH RECORD RESURFACING MACHINE 3 Sheets-Sheet 2 Filed Dec. 17, 1938 if as 4 84 Y 8 5 INVENTOR Georgia Hfhfzuzger as BY A ORNEY July 30, 1940.

G. H. FRITZINGER rnonoemra REcoRD RESURFACING momma Filed Dec. 17, 1938 3 Sheets-Sheet 5 INVENTOR AT RNEY Patented July 30, 1940 PATENT OFFICE PHONOGRAPH REooRn RESURFACING Y MACHINE George H. Fritzinger, Orange, N. J., assignor to Thomas A. Edison, Incorporated, West Orange, N. .L, a corporation of New Jersey Application December 17, 1938, Serial No. 246,304

29 Claims.

This invention relates to machines for resurfacing phonograph records. Although no unnecessary limitation thereto is intended, the invention has particular utility, and is illustrated and described, in connection with such machines as are adapted for resurfacing phonograph records of the type commonly used with commercial phonographs, or dictating machines. In some respects this invention has certain features in common with those disclosed in the copending applications of Richard M. Somers, Serial Nos. 232,766 and 264,774 respectively filed October 1938 and March 29, 1939, and respectively entitled Phonograph record shaving machines 'and Phonograph record resurfacing machines, which applications are connected by common ownership with the present application.

Phonograph record resurfacing machines of the above mentioned type commonly comprise a man- 'drel for supporting a record for rotation, and a resurfacing tool mounted on a carriage which is moved across the record by a feeding means driven coordinately with the rotation of the mandrel. The resurfacing tool is movable into operative position relative to the record to cause, as the record is rotated and the tool is moved steadily thereacross, a resurfacing, or a cutting away of a surface layer, of the record for the purpose of removing recordations therefrom to permit a re-use of the record.

In the usual operation of a record resurfacing machine there is first taken a heavy cut from the record to remove substantially all of the record material necessary for the resurfacing of the record. There may then be taken a light or finishing cut to remove any unevenness on the record surface which may haverresulted from the first cut, the finishing cut serving thus to leave the record surface in a highly smooth and p01- is-hed condition.

It is an object of my invention to provide a well-nigh fool-proof machine for resurfacing phonograph records.

It is another object of my invention to provide a novel and improved form of phonograph record resurfacing machine adapted for taking both heavy and finishing cuts. A feature of my invention is to complete the resurfacing of a record by one reciprocation of the tool thereacross; this is done by causing the resurfacing tool to take heavy and finishing cuts as the tool is respective.- ly advanced and returned across the record, from and to a start position.

It is another object of my invention to provide a machine of the type just described-which is largely automatically controlled, and which is yet so arranged as to enable the operator to exercise a high degree of control thereover, particularly in ways to permit the taking of heavy and finishing cuts at will by performing simple manipulations on the machine.

It is another object of my invention to automatically perform various operations on the machine incidental to its starting and stopping to facilitate the use of the machine, the performance of these operations being, however, so restricted as to prevent possible mis-operation of the machine.

It is another object of my invention to automatically control the machine in ways to permit immediate inspection of the record surface after each traversal of the tool thereacross.

It is a further object of my invention to cause a finishing cut to be made on the record by performing a single manipulation on the machine after a heavy out has been taken.

In conventional phonograph record resurfacing machines it has been common to provide a tool,- carriage which is both slidably and tiltably mounted, the carriage being tiltable so that the tool may be moved free of the record, without releasing the tool from a set position, and so that the carriage may be disconnected'from its driving means to permit manipulation of the carriage across the record as desired. The carriagedriving means is commonly in the form of a feed screw with which there is engaged a feed nut carried by the carriage, the feed nut moving out of engagement with the feed screw when the carriage is tilted. With the above arrangement, the 35 operator may accidentally attempt to manipulate the carriage While failing to tilt the same sulficiently to cause the feed nut to be fully disengaged from, the feed screw, thereby causing the feed nut to scrape along the feed screw; the operator may also fail to release the tool from a previously set position,.after mounting a thicker record on the machine than the previously mounted one, and then manipulate the carriage across the record, thereby causing possible damage to the record and tool by the scraping of the tool thereon.

It is an object of my invention to provide such improved arrangement of a machine as will cause such mic-operations as noted. above, as well as 50 other possible mis-operations, to be prevented. Various objects and features of my invention are to lock the carriage against manipulations across the record while the tool is in a set or operative with the carriage at will without tilting the latter, and to control the coupling of the carriage with its driving means by the tool-setting mechanism and/or at least in part as an incident of controlling the driving means.

It is another object of my invention to provide a new and improved. form of finishing-cut controlling means.

It is another object of my invention to provide an improved form of tool-setting gauge for permitting the setting of the tool into operative position while the tool is 01f the record.

It is another object of my invention to retract or free the gauge from the record as an incident of setting the tool into operative position. A feature of my invention is to effect by a single manipulation, in the sequence here named, the setting of the tool into operative position, the locking of the same therein, and the retracting or freeing of the gauge from the record.

Another object of my invention is to cause the gauge to be moved relative to the tool, after the latter has been set into operative position, to retract the gauge from the record, and. to automatically restore the gauge to render the same effective for a resetting of the tool as an substantially along the line 6-3 of Fig. 1;

incident of such resetting.

Another object is to restore the gauge into normal operative position relative to the tool as an incident of moving the tool out of operative position.

Other objects and features of my invention will appear from the following description and the appended claims.

In the description of my invention reference is had to the accompanying figures, of which:

Figure 1 is a top plan View of a phonograph record resurfacing machine in which my invention is incorporated, showing the tool-setting mechanism in operative position and the finishing-cut controlling means in inoperative position;

,Fig. 2 is a top plan view of parts of the machine in accordance with my invention, principally showing in detail the interlinkage system largely dottedly shown in Fig. 1;

Fig. 3 is a vertical cross-sectional view of a portion of the machine in accordance with my invention, taken substantially along the line 3. -3 of Fig. l but showing the finishing-cut controlling means in operative position;

Fig/l is a vertical cross-sectional view taken substantially along the line 4-4 of Fig. 1 but showing the tool-carriage in the vicinity of its start position;

Fig. 5 is an enlarged vertical cross-sectional view, taken substantially along the lines 5-5 of Fig. 1, principally showing an eccentric, journalled end portion of the carriage support rod; Fig. 6 is a vertical cross-sectional view taken Fig. '7 is a fractional cross-sectional view of the tool-setting mechanism, showing the means for locking the tool in a set position;

Fig. 8 is a partial right hand View of the machine, generally similar to Fig. 6, but showing the tool-setting mechanism in inoperative position;

Fig. 9 is a vertical cros-sectional view taken substantially along the line 9-9 of Fig. 1, principally showing the operative connection between the carriage-driving means and the toolsetting mechanism;

Fig. 10is a cross-sectional view taken substantially along the line Ill-l0 of Fig. 8;

Fig. 11 is a cross-sectional View, taken substantially along the line H of Fig. 10;

Fig. 12 is a cross-sectional view taken substantially along the line I2 of Fig. 10;

Fig. 13 is a view taken of a portion of the toolsetting mechanism showing a modified form of tool-setting gauge;

Fig. 14 is a cross-sectional view taken substantially along the line I l-44 of Fig. 13; and

Fig. 15 is a cross-sectional View taken substantially along the line 15-15 of Fig. 13, and show ing in dash-dot lines the retracted position of the gauge while the tool is in set position.

Reference being had to the figures, particularly Figs. 1 and 6, there will be seen a phonograph record resurfacing machine in which my invention is incorporated. The machine comprises a base plate I provided with various upright standards; a left-hand standard 2, an intermediate standard 3, another intermediate standard 4 positioned in front of the standard 3, right-hand standards 5, 6 and 1 respectively positioned from back to front, and other standards hereinafter mentioned. In the right-hand portion of the base plate I adjacent to the standard 6 there is also provided an upright boss 8 on which there is pivotally mounted, by a screw 8, an end-gate it] normally held in closed position (as shown in Fig. 1) by a latch H pivoted to a rightward extension I on the standard I. The end gate H] supports: a conically pointed stud l2 adjustable with respect thereto as by an adjusting screw I3; the standard 2 supports another conically pointed stud l4 secured thereto by a set screw IS. The studs M and I2 form left and right thrust bearings for a shaft l6 which passes through an oversized hole I! in the intermediate standard 3 and which carries a mandrel l8 for holding a cylindrical record 19 to be resurfaced. In the operation of mounting a record on, or removing a record from, the mandrel [8 the end-gate I0 is swung open to expose the right end of the mandrel. During the time the end-gate is open the shaft 16 is intermediately supported by the standard 3 and retained in engagement with the stud M by means of a collar 20, secured to the shaft by a screw 2|, which abuts against the intermediate standard 3 to limit movement of the shaft in a rightward direction.

Respectively supported by the front left and right standards 4 and 'l and by the left and right standards 2 and 6 are the front and back rods 22 and 23 extending laterally along the mandrel 18. When the end-gate H) is closed the mandrel I8 is rotatably supported in parallel relation to each of the rods 22 and 23. Slidablymounted on the rods 22 and 23 is a toolcarriage 24 having a sleeve bearing 25 embracing the rod 23. As shown in Fig. 6, the carriage 24 is substantially semi-circular in shape, curving forwardly from the back rod over the mandrel l8 and terminating in an open slot 25 in which slidably fits the front rod 22. The carriage is thus mounted for movement back and forth across, and throughout the length of, the mandrel l8.

On the right side of the carriage there is an extension 21, square-shaped as viewed from the side thereof, which substantially overlies the rod 23. This extension carries a resurfacing tool 28 comprising a knife blade 29 mounted on a knife bar 30 which is slidably supported by the extension 2'! for movement towards and away from the record, the knife bar being restricted against turning by a key I engaging'a longitudinal slot I88 provided in the bar. The means for setting the resurfacing tool into operative positiona position of thetool in which the knife blade 29 engages the record-and for releasing the same from operative position may be of a construction such, for example, as is disclosed in Brown Patent No. 2,137,383, issued on November 22, 1938, and entitled Reclord shaving machine.

The tool setting and releasing mechanism of the type above mentioned is shown in Figs. 1, 6 and 8, and may be briefly described as follows: A cap 3| is slidably mounted on the extension 21 and secured by a screw 32 to a guide rod 33 slidably supported by the extension 21 in parallel relation to the knife bar 30. The cap 3| is resiliently coupled to the knife bar in order that when the cap is moved downwardly towards the record the knife bar is yieldably moved therewith. This resilient coupling comprises a compression spring 34 coiled about a reduced-diameter portion 38' of the knife bar 30 between a shoulder 30", formed by the reduced diameter portion 30', and the top of the cap 3|. The cap 3| is urged upwardly by a compression spring 35 coiled about guide rod 33 between the extension 27 and the top of the cap 3|, but upward movement of the cap 3| relative to the knife bar 30 is limited by the contact of the top of thecap 3| with a headed screw 36 on the bar. By reason of the upward biasing of the cap 3|, the resurfacing tool 28 is normally maintained in inoperative position, this position being defined by the contact of a stop collar 31, secured to the knife bar in a manner hereinafter explained, with the underside 3| of the carriage extension 21.

The setting of the tool into operative position, and its release therefrom, is controlled by a lever 38 pivoted on the right side of the carriage extension 21, as on a post 39, and having a short arm 40 which is coupled to the cap 3| by an angular link 4|, the link being pivoted to the arm 40 by a pin 42 and to the cap 3| by the pivot screw 43. As the lever 38 is swung forwardly in a counter-clockwise direction the cap 3| and the knife bar 30 are moved towards the record to effect the setting of the tool into operative position. Such forward or setting movement of the lever 38 is limited to the position shown in Fig. 6 by the impingement of the link 4| against the hub 38 of the lever. When the lever 38 is in this most forward position the pin 42 is slightly past dead center with respect to the pivot axes of the lever 38 and the pivot screw 43; the upward biasing force exerted on the cap 3| then causes the lever 38 to be urged in a counterclockwise direction. Thus when the lever 38 is moved in a counter-clockwise direction into its most forward position wherein the hub 38' contacts the link 4|, the lever is releasably held in that position to maintain the tool 25 in operative position; and when a slight tripping movement is imparted to the lever 38 in a clockwise direction to return the pin 42 across the dead center line aforementioned, the tool will be released from operative position by reason of the upward biasing of the cap 3| In performing a resurfacing operation the resurfacing tool is first set into operative position relative to the record to be resurfaced, and then the tool is made to traverse the record 1ongitudinally thereof coincidentally with a rotation of the record. As the tool so traverses the record a surface layer of the record is cut away,

this cut-away layer being directed downwardly by a chip chute 44, secured to the knife bar by a screw 44, through a laterally extending opening 45 in the base plate I, for example into a suitable container not shown.

A traversing movement of the tool relative to the record is caused by feeding the carriage 24 along its support rods 22 and 23. The feeding means for the carriage comprises a feed screw 59 rotatably supported by the left and right standards 2 and respectively carrying conically pointed studs 68 and 6| which serve as thrust bearings for the feed screw. On the left side of the carriage 24 there is provided a block 62 (see Fig. 9) embracing the carriage sleeve 25 but held against movement longitudinally of the sleeve by a stop collar 63 secured to the sleeve by a set screw 63. Secured to the block 62 by the screws 62' is a resilient and rearwardly ex-v tending arm 64 carrying a feed nut 65 which normally engages the underside of the feed screw 59. When the feed nut and feed screw are engaged, a rotation of the feed screw will cause a steady movement of the carriage along the rec- 0rd, the direction of carriage movement depending upon the direction of rotation of the feed screw.

The feed screw is adapted to be rotated in one direction or the other, as desired, coincidentally with a rotation of the mandrel shaft l6 by a mechanism comprising a beveled gear 66 rotatably mounted on a shaft portion 59 of the feed screw 59and coupled by an intermediate beveled gear 61, journalled in a standard 68, to another beveled gear 69 generally similar to the gear 66 but carried by a pulley 18 also rotatably mounted on the shaft portion 59'. On the shaft portion 59 there are provided left and right stop collars TI and 12 which serve to hold the gears 69 and 66 in engagement with the intermediate gear 61. With this arrangement a rotation of the pulley 18 will cause the gear 66 to be rotated at the same rate as that of'the pulley but in a direction opposite thereto. The gears 66 and 69 are each freely rotatable on the shaft portion 59' but may be selectively connected with the feed screw 59 to cause the feed screw to be turned in either one direction or the other.

The connection of the gears 66 and 69 with the feed screw 59 is effected by a clutch mechanism comprising toothed clutch members 13 and I l embracing the shaft portion 59' and respectively secured to the gears 66 and 69 on their adjacent sides. On the shaft portion 59' between the clutch members 13 and 14 there is provided a sliding clutch collar 15 suitably splined to the shaft portion 59' as by a screw and slot arrangement of which the screw appears as 16. The clutch collar 15 is provided at its left and right sides with teeth adapted for selective engagement with the toothed clutch members '14 and 13. When the clutch collar 15 is moved to the left into engagement with the clutch member 14, the feed screw 59 is connected with the pulley 16 for rotation therewith. When the clutch collar I5 is moved to the right into engagement with the clutch member 13, however, the feed screw is connected with the gear 66; since the gear 66 is rotably coupled to the pulley for rotation in the direction opposite thereto the feed screw will now be rotated in the direction opposite to that of the pulley 79.

When the machine is in use the pulley 18 is rotated continuously, in a clockwise direction as viewed from the left end thereof, as by a belt (not shown) coupling the pulley l9 with a drive pulley TI on the mandrel shaft 15. The direction of the threads on the feed screw 59 is such that a clockwise rotation of the feed screw, asviewed from the left end thereof, will cause a leftward movementhereinafter called the advance movement-of the carriage 24. Thus when the clutch collar 15 is in engagement with the clutch member i l the carriage-feeding means is conditioned for carriage advance, and when the clutch collar is in engagement with the clutch member '13 the carriage-feeding means is conditioned for carriage return.

The driving of the carriage-feeding means, as well as of the rotation of the record l9, may be effected by a suitable driving motor, not herein necessary to show, which may be located beneath the base plate I and be coupled to a pulley 18 on the mandrel shaft 56 as by a belt (not shown which may pass through an opening 19 in the base plate I. The starting and stopping of the driving action of the motor may be controlled at will by a suitable toggle switch 89 adapted to snap into on and off positions and having a pair of terminals 8i connected to a pair of leads 82 by which the switch may, for example, be serially connected. in the power supply circuit (not shown) of the motor. The switch 89 is located beneath the base plate I in the right forward section thereof and is supported by the base plate I as by left and right brackets of which the right bracket appears as 83, this bracket being secured to the switch by the screws 84 and to the base plate by the screw 84. Extending forwardly from the switch is an operating lever 85 rockable to the right and left to throw the switch to on and off positions. The means for manually moving the switch 85 into its respective positions comprises a forwardly extending control lever 86 having a vertical shaft portion 86' pivoted in a boss 7! extending downwardly from. the base plate I. Located beneath the boss 81 and secured by a screw 88 to the shaft portion 85' is a plate 89 having variously extending portions as hereinafter described (see Fig. 2), one of these portions being in the form of a rearwardly extending arm 9t. Pivoted to: the arm 99 is a Vertical post 9| having a vertical slot 92 through which slidably passes the switch lever 85. Thus left and right rocking movements of the control lever 86 will cause the switch 89 to be thrown into its on and off positions, indicated in Fig. 2.

Consideration being given to the structure as described so far, it will be seen that the carriage 24 is mounted so that, unlike conventional machines, it is not tiltable to disengage the feed nut 65 from the feed screw 59. In accordance with invention. this type of carriage mounting is employed to force the operator to release the resurfacing tool from a set position before manipulating the carriage across the record, thereby avoiding possible damage to the resurfacing tool and record as by a scraping of the tool thereon. Such forced release of the tool to permit a manipulation of the carriage is effected by causing the tool-setting mechanism to control the engagement of the feed nut with the feed screw, this control being such that the feed nut and feed screw are in engagement when the tool is set in operative position and out of engagement when the tool is out of operative position.

The means for so controlling the engagement of the feed nut with the feed screw is shown in Figs. 1, 6 and 9 and comprises a bar 93 secured to the left side of the cap 3| by the: screws 94 and carrying a pair of spaced leftwardly extending pins 95. Integrally formed with the feed nut carrying arm 64 is a resilient upstanding arm 95 which terminates at a point between the pair of pins 95. When the resurfacing tool 28 is set into operative position, the cap 3! then being moved downwardly, the upper. one of the pins 95 contacts the arm 96 and causes the block 62 to be rocked on the carriage sleeve in a clockwise direction (as it appears in Fig. 9), thereby effecting the engagement of the feed nut 5 with the feed screw 59; when the resurfacing tool 28 is released from operative position, the cap 3! then being moved. upwardly, the lower one of the pins'llii contacts the arm 96 and causes the block 62 to be rocked in a counterclockwise direction, thereby effecting the disengagement of the feed nut from the feed screw. Thus the lever 38 which serves as a manual means for setting and releasing the tool, also serves as a manual means for moving the feed nut into and out of engagement with the feed screw.

In taking a first or heavy cut from the record the tool is set into operative position and the carriage is then advanced-i. e., moved leftwardlyacross the record from its most rightward position wherein the tool is to the right of the record, this position of the carriage being called its start or first terminal position. Since the carriage is locked against manipulation, by the engagement of the feed nut 65 with the feed screw 59, whenever the tool is set in operative position, the operator is forced to set the tool while the carriage is in start position. To permit such setting of the tool there is provided a tool-setting gauge 91, which is offset to the left of the tool. When the resurfacing tool is set into operative position the tool and gauge are each moved towards the record until the gauge contacts the surface thereof, thereby positioning the tool relative to the record. Since the gauge is to the left of the tool-i. e., in the direction of tool advance in the taking of a heavy cut-it is important that the gauge be retracted from the record after the tool has been set. In accordance with my invention the retraction of the gauge from the record occurs automatically after the tool has reached a set or operative position, as an incident of tool setting. This is done by performing but a single manipulation on the machine: the moving of the tool setting lever 28 from its unoperated position shown in Fig. 8 to its operated or set position shown in Fig. 6. As the lever 38 is so moved, the tool is moved into operative position, locked in that position, and then the gauge is retracted from the record, in the sequence here named.

In the description of the tool-locking means and the tool-setting gauge 9l--the other parts of the tool-setting mechanism having been heretofore describedreference is had to Figs. 6, '7, 8, 10, 11 and 12. The tool-locking meanscomprises a small pin 98 slidably mounted in the extension 2'! for transverse movement with respect to the direction of movement of the knife bar 30. The inner end of the pin 98 slidably contacts a fiat 99 provided on the knife bar 39 longitudinally thereof, whereas the outer end projects slightly beyond the right side wall of the extension 21. Pivoted on the post 39 between the lever 38 and the right side wall of the extension 21' is a cam member II]! in the form of a disc having an open sector I02 of substantially 90 in angular length. The cam member slidably engages the outer end of the pin 98, the portion of the cam member which so engages the pin being beveled to form a cam face I03 (see Figs. 7 and 10) "The cam face I03 is of such shape that when the cam member is turned slightly in a counterclockwise direction, as it appears in Fig. 7, the pin 98 is pressed inwardly against the flat 99 of the knife bar, thereby looking the bar. Such turning of the cam member IOI is adapted to. occur as an incident of toolsetting by means of a coupling between the toolsetting lever 38 and the cam member IOI comprising a leftwardly' extending pin I04 provided in the hub 38' of the tool setting lever and extending into the open sector I02.

As the lever 38 is swung forwardly to set the tool, the pin I04 first traverses the length of the open sector I 02 and then, as the lever 38 is moved through the end portion of its travel, the pin I04 contacts the edge I02 of the sector and moves the cam member IOI therewith in a counterclockwise direction, causing the locking of the resurfacing tool in its set position. When the lever 38 is released, the cap 3| is moved upwardly with considerable acceleration by the spring 35, thereby imparting a like acceleration to the lever 38. The cap 3I is, however, momentarily stopped in its upward travel by its contact with the head 36 of the knife bar 30. While the cap 3I is stopped the inertia of the lever 38 causes it to move onwardly into its unoperated position, this onward movement of the lever 38 being permitted by reason of the elongated slot 43 in the link 4I serving to form a loose connection between the link 4I andthe cap 3I. The movement of the lever 38 towards .unoperated position causes the pin I04 to traverse the length of the sector I02; as the lever 38 nears its unoperated position the pin I04 encounters the edge I02 of the sector and moves the cam member MI in a clockwise direction to cause the unlocking of the tool from its set position. Immediately upon the unlocking of the tool the cap is moved further upwardly by the spring 35 to cause the tool to be moved into its inoperative position.

The tool-setting gauge 91 is carried by the knife bar 30 but is adapted to have a controlled movement longitudinally of the bar. The gauge has a foot I05 adapted to contact the record surface during the setting of the tool and a collar portion I03 embracing the knife bar. The collar portion I 06 is disposed between the stop collar 3'! and the chip chute 44, the chip chute having a recess I01 surrounding the bar to permit an elongation of the collar portion I06 so as to provide a good bearing for the gauge 91 on the bar 30. Turning of the gauge relative to the knife bar is prevented by a pin I08 in the chip chute engaging a slot I09 extending axially along the collar portion. On the side of the collar portion I03 adjacent to the stop collar 31 there are provided two shoes H0 angularly spaced on the collar portion by 180. These shoes are urged into contact with the stop collar 31 by means of a pair of compression springs III respectively disposed in a pair of recesses II2 provided in the body of the chip chute 44. These recesses are angularly spaced at 180 from each other and at substantially 90 from the shoes H0, and are open on the side of the chip chute which is adjacent to the collar portion I06.

While the resurfacing tool is being set and locked in operative position the gauge 91 is maintained in a fixed or normal position relative to the tool such that when the gauge is in contact with the surface of the record the tool is positioned relatively thereto to take a heavy or first out fromthe record, this position of the tool being called its set or operative position. Im-

mediately after the tool is locked in its set position the gauge is retracted from the record by t the terminal movement of the tool-setting lever 38. To effect this retraction of the gauge the stop collar 31 is pivoted on the knife bar 30, but is prevented from moving longitudinally of the bar, by means of a set screw H3 which threads radially through the collar and engages an annular groove segment I I4 on the knife bar. The stop collar is also provided with a pair of inclined cam faces'II5 angularly spaced at 180.

These cam faces are inset in the surface of the stop collar adjacent to the collar portion I06 and are adapted for respective engagement with the shoes IIO. During the setting of the tool the shoes IIO are out of engagement with the inset cam faces H5. When, however, in the set-,

ting of the tool, the tool-locking means is rendered sufficiently effective to hold the tool in set position against the force of the spring 34 (which spring urges the tool towards the record by reason of it havingv been compressed during the operation of setting the tool), then the stop collar 31 is turned by the terminal movement of the toolalong the tool, for retraction from the record, it

no longer bears a normal position relative to the tool, and must therefore be restored to such a normal position when the tool is to be reset in order that it may again perform its normal function. Itis a feature of my invention to automatically cause-such restoration of the gauge as an incident of releasing the. tool from set position. To effect this restoration there is provided on the hub 38' of the lever 38 an arm II8, an-

gularly spaced at approximately 90 from the arm H6, which contacts the pin I" as the lever 38 is moved into its unoperated position and thereby turns the collar 31 to cause the cam faces II5 to be moved out of alignment with the shoes H0. As the cam faces II5'are so moved the gauge 911s moved downwardly along the knife bar 30, against the force of the compression springs III, into normal position relative to the tool.

It is a feature of my invention that when the carriage is in start position the carriage feeding means is operable to effect only an advance movement of the carriage. This is done'by a means, hereinafter described, which automatically insures the-engagement of the clutch collar 75 with the clutch member 14 whenever the carriage is in its start or first terminal position. Upon setting the tool into operative position while the carriage is in start position, the operator need then only move the manual control '86 leftwardly into on position to place the machine in operation'for the taking of a first or heavy out. When the resurfacing tool has traversed the record, the carriage reaching its leftward or second terminal position, it is desirable that the operator be permitted to immediately inspect the record surface to determine whether further cuts on the record, of either a heavy or finishing char- I31 in the bar.

,acter are; required to obtain the degree of surface smoothness desired. It is a feature of my invention to permit such immediate inspection of the record byproviding, in a machine of the type here described, simple means for auto- -matically stopping the machine at the completion of each cut made on the record. The means for automatically stopping the machine at the completion of the first or heavy cuti. e., when the carriage reaches its second terminal position-may now be described.

The automatic stopping of the machine, as the carriage is 'moved into its second terminal position, is'eifected by an interlinking mechanism between-the carriage and the switch 80. This mechanism, .as shown in Figs. 1, 2 and 6, comprises an arm I25 pivoted by a pin I26 on an extension I21 projecting forwardly and downwardly from the hub 24 of the carriage 24. The arm I25 is normally held in a downwardly extending position wherein it partially passes through the opening 45 in the base plate I, as shown in Fig. 6, by a tension spring I28 connected between an ear I25 of the arm I25 and an ear I29 secured to the carriage, this position of the arm I25 being defined by the contact of a stop I25" on the arm with the hub 24 of the carriage. When the carriage nears its second terminal position theiarm I25 contacts'a turnedup lug I30 on anarm I3I of a lever I32 and turns thel ever in a clockwise direction.

I32 is pivoted by a screw I33to a boss I33 on the underside of'the base plate I, and has a rightwardly extending arm I34 slidably connected to a laterally extending bar I35 by a pin I36 on the arm I34 engaging an elongated slot The bar I35 is supported by the base plate I in a manner permitting a parallel motion of the bar in forward and rearward directions; the bar being connected to the base plate by.left andright links I38 and I39 pivoted to thebar I35 by the respective pins I40 and I4I and to the underside of the base plate I by the respective screws I49 and I4I. When the lever I32 is turned in a clockwise direction, as by the movement of the carriage into its second termin- .al position, the bar I35 is' moved forwardly and the links I38 and I39 are turned in a counterclockwise direction. Such turning of the link I39 causes the switch to be thrown into off position .by means of a rightwardly extending arm I42 on the link I39 whichis coupled, by a long angular link member I43 extending forwardly along the right side of the machine, to a rightward extension I45 of the plate 89, the link member I39 being pivoted to the arm I42 by apin I42 and to the extension I45 by a pin I44.

In order that the switch 89 may snap into off position, by reason of its toggle nature, as soon as the. movement of the carriage into its second terminal position has caused the switch to be moved past dead center position, the link member I43 is loosely connected to the extension I45 by the provision of an elongated slot I48 in the extension through which the pin I44 may slide. When the switch 89 is in on position the pin I44 rests in'the rearward part of the slot I46; rearward movement of the link member I43 as caused by the movement of'the carriage into second terminal position thus causes the .plate 89 to be rocked in a counterclockwise direction to cause the switch to be moved towards 01f position. When the switch is moved through dead center position, the

notch I46.

center position the pin I44 is out of the notch The lever switch'snaps into off position, causing the pin I44'to takeaforward position in the slot I46. :Although the pin I44 normally rests, when the switch I0 is in on position, in an inwardly center position in the direction of off position. The counterclockwise turning of the plate 89 necessary to effect such movement of the switch causes an inclined cam face I47, provided at the end of a principally leftwardly extending portion I43 of the link member I43, to impinge against the boss 81 and thereby to limit the leftward movement of the link member I43 so as to cause the pin I44 to be moved out of the *When the switch 89 is past dead I46 leaving the switch free to snap into off position.

If the machine is to be restarted while the carriage is in its second terminal position. it will be for the purpose of taking a finishing cut on therecord. The finishing-cut operation is wholly controlled by a finishing-cut controlling lever I49. This lever is arranged so that by a single manipulation thereof all actions are performed which are necessary to place the machine in such operating condition as will cause a finishing cut to be taken. To prevent the operator from inadvertently restarting the machine for the finishing-cut operation by manipulating the control lever 86, this lever is rendered ineffective as a means for restarting the machine while the carriage is in its second terminal position. This is done by the pin I44 remaining in the notch I49" until the switch 80 has been moved past its dead center position in the direction of oiT position. In moving the switch 89 in the direction of on position, the rearward end of the "24 is in its second terminal position, thereby pre venting the moving of the switch into on position as by the lever 86.

When, however, the carriage is returned from its second terminal position the arm I25 is moved free of the lug I30 and the link member I43 is then moved forwardly, by a tension spring I48 connected between the link member and a pin I48 on the base'plate I. The most forward position of the link-member I43 is defined by the abutment of the bar I35 against a stop lug I39 on the link I39. When the link is in this position and the switch 80 is in off position the pin I44 rests in the forward end portion of the slot I46. The switch 80 may then be manipulated into on position by the control lever 86. When the switch is moved into on position the pin I44 again engages the notch I45 by reason of the spring I48 being directed so as to also urge the link member I43 leftwardly.

Upon the inspection of the record surface at the completion of a heavy cut on the record the operator will normally do one of three things: remove the record from the machine, take another heavy cut, or take a light finishing cut.

If a record is to be removed the operator will first open the end gate I9 and then operate a .record ejector which, being well known in the art.

is sufficiently described in the present instance by the statement that it comprises a leftwardly extending handle 46 integral with a hub 41 and an upstanding arm 48, pivoted on a pin 49 supported by the intermediate standard 3 and a standard 50, positioned in front of the standard 3, to which the pin is made secure by a set screw and a shoe 52 carried by the arm 48 and. adapted to contact the record when the record ejector is operated. The ejector is normally maintained in an unoperated position, shown in Fig. 1, by a coil spring 53, but in the operation of the ejector the handle 46 is raised against the force of the spring 53 to move the shoe 52 rightwardly against the record to push the record off from the mandrel I8. Commonly provided in combination with the record ejector is a mandrel brake operated by the ejector and comprising an arm 54 pivoted on. the pin 49 behind the ejector arm 48 and bearing a brake shoe 55. The coupling between the ejector and the brake comprises a spring 56 coiled about the hub 47 and hooked at one end about a forwardly extending pin 57 on the arm 54 and at the other end about a rearwardly extending pin 58 on the ejector arm 48 located to the right of the pin 51, the spring 56 thus urging pins 51 and 58 into contact with each other. Thus, when the record ejector is operated the shoe 55 is yieldably moved into contact with the mandrel to retard by friction rotation thereof.

If, at the completion of a heavy cut on the record, the operator decides to take another heavy cut on the record, he will release the tool from its set position by returning the tool-setting lever 38 to its unoperated position, and then return the carriage to start position, the initial returning movement of the carriage causing the control lever 86 to be rendered effective as a means for manipulating the switch 80 into onr position as hereinbefore described. Upon the returning of the carriage to start position, the resetting of the tool and the moving of the control lever 86 to place the switch 86 into on position, the machine will go into operation to take another heavy out. At the completion of this cut the machine will be again automatically stopped; at this time the above set of operations may be again repeated to effect another heavy out, if desired.

If, at the completion of a heavy cut-such cut being usually sufiicient to remove substantially all of the record material necessary in the resurfacing of the recordthe operator decides to take a finishing cut for the purpose of smoothing or polishing the record surface, he will manipulate the heretofore mentioned finishing-cut controlling lever I49 downwardly. This causes the resurfacing tool to be advanced towards the record and the carriage to be fed across the record in a rightward direction from the second terminal position-i. e., returned to its start positionto cause the finishing cut to be taken.

The finishing-cut controlling lever I49 is mounted on the left end of the front carriage supporting rod 22 and is normally maintained in an upward or inoperative position, shown in Fig. 6.

As the lever I49 is manipulated into a downward or operative position, shown in Fig. 3, various operations are effected to place the machine in condition for taking the finishing out. These operations comprise principally the moving of the resurfacing tool a predetermined distance towards the record, the rightward shifting of the clutch collar I5 into engagement with the clutch member 13 to reverse the action of the carriage feeding means, and the throwing'of the switch 80 into on position to cause the machine to be put into operation.

The means for causing the resurfacing tool 26 to I be moved towards the record, into a position for taking a finishing cut thereon, may be first described. Reference being had to the figures, particularly Figs. 1, 2 and 5, it will be seen that the finishing-cut controlling lever I49 is secured to the left end of the carriage supporting rod 22 by a pin I 50 so that the rod 22 will turn coordinately with the lever I49 as this lever is moved between its operative and inoperative positions. The rod 22 is provided with left and right eccentric end portions I5I and I52 of which the leftward end portion I5I appears clearly in the enlarged view of Fig. 5. These left and right end portions are respectively journalled in the left and right standards 4 and I, the left end portion I5I having an annular groove I 53 engaged by a set screw I53 in the standard 4 to restrict the rod 22 against longitudinal movement. When the lever I49 is swung down-wardly into its operative position the rod 22 is turned in a counterclockwise direction as viewed from the right end thereof. The eccentric end portions I5I and I52 are so positioned relative to the rod 22 (see Fig. 5) as to cause the rod 22 to move downwardly when the finishing-cut controlling lever I49 is moved into operative position. This downward movement of the rod 22 causes the carriage 24 to be tilted slightly downwardly, thereby causing the resurfacing tool to be moved towards the record. As the lever I49 is returned to inoperative position the reverse action takes place: the rod 22 being turned in a clockwise direction, the carriage being tilted upwardly into normal position, and the tool being retracted from the record.

In order that a movement of the finishing-cut controlling lever I49 into operative position may cause the carriage-feeding means to be reversed the lever I49 is provided with an arm I54 extending downwardly through an elongated opening I 55 in the base plate I. Pivotally connected to the lower end of the arm I54, by a pin I54, is a rearwardly extending bar I56. This bar is slidably supported at its rearward end portion by a shoulder screw I51 which passes through an elongated slot I58 in the bar to thread into a standard I59 extending downwardly from the base plate I. The bar I56 is coupled to the clutch collar 15 by an L-shapedlever I60 having a vertical leg I60 extending through an opening I6I in the: base plate I and a horizontal leg I60" below the base plate I which extends rightwardly in normal relation to, and to a position below, the bar I56. The vertical leg I60 is pivoted, as by a shoulder screw I62, to a rearwardly extending boss I62 on an upright standard I63 positioned in front of the clutch collar I5, and carries at its upper end a pin I64 engaging an annular groove I65 in the clutch collar 15. Coiled about the boss I62 is a tersional spring I66, hooked at one end on the standard I63 and at the other end on the leg I60 of the lever I60, for biasing the lever I60 in a counterclockwise direction. This biasing of the lever I60 causes the clutch collar to be normally held in its most leftward position-the position for carriage advance. When the finishing-cut controlling lever is moved downwardly into operative position, however, the bar I56 is moved rearwardly. As the bar I56 is so moved a cam I61, provided along the lower edge thereof, slidingly engages the lower leg I60 of the lever I60 and thereby turns the lever in a clockwise direction to cause the clutch collar 15 to be moved into its most rightward positionthe position for carriage return. "iWhen the finishing-cut controlling lever is returned to inoperative position the reverse action takes place:

the cam I81 moving free of the lower leg I68", and

the spring I58 then turning the lever I88 to cause the shifting of the clutch collar into its leftward position.

It will be seen that the cam I81 has an inclined face I51 and a relatively long flat face I81". In the initial movement of the lever I49 from inoperative to operative position the leg I89" traverses the inclined face I81 to cause the rightward movement of the clutch collar 15, the collar being then held in position as the leg I59 traverses the flat face I81". This is done in order that the carriage feeding means will be reversed before being put into operation, which operation is effected by the final movement of the control lever I49 into operative position, as is now described.

As hereinbefore described, when the carriage 24 is in its second terminal position the Switch 88 is locked in oif position. The initial movement of the finishing-cut controlling lever I49, however, removes the lock on the switch 89, the remaining movement of the lever I49 into operative position then causing the switch 89 to be thrown into on position. To remove the lock on the switch 88 the arm I25 is moved rearwardly into a position free of the lug I38, thereby rendering the lever I32 free to turn in a counterclockwise direction so that the link member I48 may move forwardly, as by reason of the spring I48. to place the pin I44 in the forward portion of the slot I48. To move the arm I25 rearwardly there is provided on the bar I59 centrally thereof an arm I68 extending upwardly through the opening 45 in the base plate I and turned over to the right to form a horizontal table I99 extending rearwardly from the arm I891 at a level slightly above the lug I38 of the lever I32 and the top of the base plate I. When the carriage is in its second terminal position and the finishing-cut controlling lever I49 is in inoperative position the rear edge I89 of the table I69 lies directly in front of the arm I25. When the finishing-cut controlling lever I49 is moved through the initial portion of its travel into operative'position the table I59 is moved rearwardly over the lug I38, thereby causing the arm I25 to be moved rearwardly out of contact with the lug. When this occurs the lever I32 moves in a counterclockwise direction into the position shown in Fig. 2 to cause the switch 88 to be unlocked.

The means, operated by the lever I49, for throwing the switch 88 into on position as shown in Figure 2 and comprises a forward extension I18 on the plate 89, lying below the control lever 88, which is pivotally connected by a pin I18 to a link member I1I which is extended leftwardly and pivotally connected by a pin I1I to an arm I12 of an angular lever I13 pivoted by a pivot screw I14 to a boss I14 extending downwardly from the base plate I. The other arm I12 of the lever I13 carriesa pawl I15 pivoted thereto by a pin I18. The pawl I15 is biased in a clockwise direction by a tension spring I16 connected between ears I15 and I13 on the pawl I15 and lever I13 respectively. Movement of the pawl in a clockwise direction is restricted, however, by the contact of a lug I15" on the pawl with the arm I12.

When the switch 88 is in off position the pawl I15 lies in a position, as shown in dash-dot lines in Fig. 2, in the path of movement of a :bracket member I18 secured to the rightside of the bar I58. After the arm I25 has been moved free of the lug I30, in the movement of the finishing-cut controlling lever I49 to operative position, the bracket member I18 contacts the pawl I15 and turns the lever I13 in a clockwise direction; such movement of the lever I13 causes the switch 88 to be moved from off position through its dead center position, the switch then snapping into on position. When the finishing-cut controlling lever I49 has reached its operative position the bracket member I18 is in the position indicated in dash-dot lines in Fig. 2, the pawl I15 having now been moved out of the path of the bracket I15 in the position shown by reason of the snapping of the switch into on position.

The finishing-cut controlling lever I49 is normally maintained in inoperative position by means of a tension spring I11 which urges the bar I56 forwardly, the spring I11 being connected between a pin I18 on the bar I58 and a pin I18 on the base plate I. When, however, the finishing-cut controlling lever I49 is moved into operative position it is releasably held therein by means of a latch I19 (see Figure 6) carried by the carriage 24 and disposed above the carriage supporting rod 22 in a vertical slot I80 which is provided in the forward portion of the carriage centrally thereof. The latch I19 is pivoted by a pin I8I to a slotted boss I82 extending forwardly of the carriage, and is provided with an arm I83 extending upwardly in front of the carriage and biased thereagainst by a cantilever spring I84 secured to the carriage by a screw I84. In the slot I8I] there is provided a flat disk-like member I85 embracing the rod 22 and splined thereto by means of a key portion I85 on the member I85 engaging a longitudinal groove I89 in the rod 22 as shown in Figure 3. Thus the member I85 moves with the carriage and turns with the rod 22. When the finishing-cut controlling lever I49 is moved into operative position the latch I19 catches on a tooth I85 provided on the member I85 and locks the rod 22 against turning in a clockwise direction, as viewed from the right end thereof, thereby holding the lever I49 in operative position.

When the finishing-cut operation is started the carriage is fed in a rightwardly direction to its start position. When the arm I 25 on the carriage has returned to the right of the lug I38, the arm I25 slides off from the table I89 and moves forwardly, as by reason of the spring I28, into position to contact the lug I38 upon the next advance of the carriage. When the carriage reaches its start position the machine is again automatically stopped, the knife is released, and the finishing-cut controlling lever I49 is returned to inoperative position. Thus there will be next taken a heavy out upon resetting the tool and restarting the machine.

The means for stopping the machine at the completion of a finishing cut is shown in Figs. 1, 2, 3 and 4, and comprises a lever I81 pivoted by a pivot screw I88 on a leftward extension 1" of the standard 1. The lever I81 extends downwardly through an opening I89 in the base plate I and terminates in a socket I90 fitting over the top of a pin I9I provided on the arm 98 of the plate 89. The upward portion of the lever I81 has a leftwardly extending arm I92 terminating along a vertical face I92, as shown in Fig. 4. Above and to the left of the face I92 there is provided on the lever I81 a cam extension I93.

As the carriage nears its start position a short rearwardly extending arm I94'on the member I85 contacts the face I92" andturns the lever I81 in a clockwise direction, as viewed from the front, thereby causing the plate 89 to be turned to cause the switch 80 to be moved towards o posi tion. When the switch has been moved, by the return of the carriage, through its dead center position the switch snaps into its off position, such snapping of the .switch, causing the lever I81 to be turned further in a clockwise direction. As the lever is so turned the cam extension I93 contacts a projection I19 on the latch I19 and moves the latch upwardly out of contact with the tooth I85, thereby releasing the finishing-cut controlling lever I49 from its latched condition. Thus as the carriage moves into start position the switch 89 is moved through its dead center position in the direction from on to ofi position; the switch thenmoves on into off position, by reason of its toggle nature, and by such onward movement causes the finishing-cut controlling lever I 49 to bereturned to inoperative position.

When the return of the carriage has caused the switch 89 to be moved past dead center position in the direction of o position the pawl I15 is again in the path of the bracket member I16. The subsequent release of the finishing-cut controlling lever I49 causes the bracket member I16 to move forwardly. As the bracket member I16 so moves it first impinges against the pawl I15 and moves the pawl out of its path, as by turning the pawl in a counterclockwise direction against the force of the spring I16. When the bracket has moved past the pawl, the latter then snaps back into the path of the bracket member I16 into the position shown in dash-dot lines in Fig. 2. v

The means for automatically releasing the resurfacing tool 28 from operative position-as the carriage moves into start position comprises, in addition to structure hereinbefore described, an angular lever I95 (see Figs l, 6 and 8) pivoted onthe carriage, at the right side thereof, by means of a relatively long shoulder screw I96 located below'the, carriage extension 21. This angular lever comprises a vertically extending lower portion I91 disposed in front of the bar I35 for sliding contact therewith; a central substantially semi-circular portion I98 partially surrounding the hub 24' of the carriage rearwardly thereof, and pivoted at its upper end on the shoulder screw I96 adjacent to the right side of the carriage; a bail portion I99 extending rightwardly beneath the screw I96; and a forwardly extending arm 200 pivoted on the outer end of the screw I96 and contacting the underside of the short arm 40 of the tool-setting lever 38 whenever the tool is set in operative position.

Upon moving the switch 8II into off position, as for example by the return of the carriage into start position, the plate 89 is turned in a counterclockwise direction. As this occurs the link member I43 is moved rearwardly, as by reason of the pin I44 being engaged with the notch I46, and the bar I35 is thereby moved forwardly. The bar I 35, as it is so moved, contacts the portion I91 of the lever I96 and moves it forwardly, thereby causing an upward movement of the arm 200. This upward movement of the arm 200- imparts a clockwise or upward tripping movement to the tool-setting lever 38, as by its contact with the arm 40 of the ,lever 38, to effect a the release cof thetool from operative position.

After the tool is released the pin I44 is moved out of the notch I46 by the snapping of the switch 80 into off position as hereinbefore described; when this occurs the bar I35 is moved rearwardly by the spring I48 outof contact with the lever I96, thereby permitting a resetting of the tool as desired.

It will be recalled that the bar I35 is moved forwardly as an incident of stopping the machine, as by the movement of the carriage 24 into its second terminal position, In order that the tool will not be then released'from operative position, to permit a finishing cut to be next taken on the record, the left end portion I35. of the bar I35 is offset to the rear so that the'bar I35 will not, in its forwardtravel, contact the lower portion I91 of the lever I96 .while the carriage is in its second terminal position.

Although the movement of the carriage into start position causes the switch 80 to be thrown into 0 position, it will be seen that the control lever 86 is yet operable to throw the switch 80 into on position, to restart the machine as for taking a heavy cut on the record, while the carriage is yet in start position. As hereinbefore explained when the switch 80 is thrown into off position by the movement of the carriage into start position the cam extension I93 on the lever I81 contacts the latch I19 and releases the finishing-cut controlling lever I49 from operative position. Upon the release of the lever I49, it is moved into inoperative position by the spring I11 this causes the arm I94 of the member I85 to be swung downwardly out of the path of the arm I92 of the lever'I81, thereby leaving the switch freely manipulable into on and "off position by the control lever 86.

To prevent possible mis-operation of the machine the vfn'iishing-cut controlling lever I49 is rendered ineffective as a means of restarting the machine while the carriage is in start position. It will be seen that upon the initial movement of the finishing-cut controlling lever I 49 into operative position the arm I94 is moved up into the path of the arm I92. A further movement of:

thelever I49 towards its operative position causes the bracket member I16 to' contact the pawl I15 and move the switch 80 towards on position;- however, before the switch is moved past its dead center position the arm I92 impinges against the arm I94 to obstruct further movement of the switch towards on position, as by means of lever I49.

Reference beinghad to Figs. 13, 14 and 15 there will be seen a modified form of tool-setting gauge 2III. While the gauge 20I is generally similar in shape to the heretofore described gauge 91 (having a foot 202 for contacting the record and a collar 203 embracing the knife bar 30) it is distinguished therefrom in that the gauge is not movable longitudinally of the knife bar 30 but is secured to the stop collar 31, as by Welding the collar 203 thereto. When the gauge 20I is in normal position relative to the resurfacing tool 28 it is positioned to the left of the latter. In

moving thelever 38 to set the tool, the foot 202 is first brought into contact with the record surface for positioning the tool relatively thereto, as for a heavy cut onthe record; the tool-locking means is rendered operative by the means hereinbefore described; and then the arm I I6, car-,,

ried by the lever-38,, contacts the pin II1 of the stop collar 31 andturns the collar in a counterclockwisedirection, asviewed from the top. Such turning of the collar 31 causes the foot 202' to.

swing forwardly out of contact with the record into a retracted position as indicated in dashdot lines in Fig. 15. Upon the release of the tool from operation position the other arm H8, carried by the lever 38, contacts the pin ll! of the stop collar 3? and turns the'collar back into its former position, thereby restoring the toolsetting gauge into normal position relative to the tool.

Although I have shown and described my invention in certain preferred embodiments, it will be understood that many modifications and changes may be made therein without departing from the scope of my invention, which I undertake to express according to the following claims:

I claim:

1. In a phonograph record resurfacing wrnine adapted for taking cuts from record and having a record-supporting means: the combination of a support member; a resurfacing tool slidably mounted on said support member for movement across the record; and manually operable means for changing the level of said support member relative to said record supporting means to cause said tool to be moved towards and away from the record, at will.

2. In a phonograph record resurfacing machine adapted for taking cuts from a record: the combination of a frame; a pair of support rods carried by said frame, one of said support rods having eccentric ends journalled in said frame; a resurfacing tool slidably mounted on said support rods for movement across the record; and means for turning said one support rod to effect movement of said tool towards and away from the record. I

3. In a phonograph'record resurfacing machine adapted for taking cuts from a record and having a carriage movable across therecord: the combination of a resurfacing tool movably mounted on said carriage for movement into and out of operative position relative to the record; driving means for moving said carriage across the record; means for coupling said carriage withsaid driving means, having operative and inoperative positions; and means, operatively connecting said'tool with said coupling means, for causing said coupling means to be maintained in inoperative position when said tool is in inoperative position.

4. In a phonograph record resurfacing machine having means for supporting a record the combination of a carriage movable across the record; a resurfacing tool on said carriage movable into operative and inoperative positions relative to the record; tool-moving means; driving means, connectable with said carriage, for moving said carriage across the record; and means, operated by said tool-moving means, for respectively causing said carriage to be connected with and disconnected from driving means when said tool is in operative and inoperative positions. v

5. In a phonograph record resurfacing machine having means for supporting a record: the combination of a carriage movable across the record; a resurfacing tool on said carriage movable into operative and inoperative positions relative to the record; tool-moving means; carriage-driving means comprising a feed screw; a feed nut movably mounted on said carriage for movement into and out of engagement with said feed screw; and

means, controlled by said tool-moving means, for efiecting engagement and disengagement of said feed nut with said feed screw.

6. In a phonograph record resurfacing machine having means for supporting a' record: the combination of a carriage movable across the record; a resurfacing'tool on said carriage movable into operative and inoperative position relative to the record; carriage-driving means; coupling means carried by said carriage and movable relative thereto to effect connection and disconnection of said carriage with said driving means; and means, operatively connecting said resurfacing tool with said coupling means, for controlling said coupling means in accordance with the position of said tool.

7. In a phonograph record resurfacing machine having means for supporting a record: the combination of a resurfacing tool; a carriage for said tool movable across a supported record; driving means for reciprocating said carriage to cause said tool to traverse the supported record in alternate directions; means operable to start said driving means at will; and means, operated by said carriage, for stopping said driving means at'the completion of each tool-record traversal.

8. In a phonograph record resurfacing machine having a rotatable support for a record: the combination of a resurfacing tool; driving means for rotating said support and for reciprocating said resurfacing tool across the record to cause said tool to traverse the record in alternate directions; a manually throwable switch for starting and stopping said driving means at will and means, automatically operated incidental to the completion of each tool-record traversal, for throwing said switch to cause stopping of said driving means.

9. In a phonograph record resurfacing machine having means for supporting a record; the combination of a carriage capable of advance and return movements relative to a supported record; a settable record-engaging tool mounted on said carriage, a finishing-cut controlling means; driving means reversible to effect advance and return movements of said carriage; and means, controlled by said finishing-cut controlling means, for reversing said driving means.

10. In a phonograph record resurfacing machine having means for supporting a record: the combination of a carriage capable of advance and return movements relative to a supported record; a settable record-engaging tool mounted on said carriage; a finishing-cut controlling means operable to move said tool a predetermined distance towards the record carriage moving means; means for automatically stopping said carriagemoving means at the completion of carriage advance; and means, controlled by said finishingcut controlling means, for restarting said carriage-moving means and reversing the same to cause the carriage return.

11. In a phonograph record resurfacing machine having means for supporting a record: the combination of a carriage; a settable recordengaging tool mounted on said carriage; means for reciprocating said carriage between first and second terminal positions to cause said tool to traverse the record in alternate directions; means for automatically stopping said reciprocating means at the completion of each tool-record traversal; manipulatable control means for starting and stopping said reciprocating means; and means, rendered operative when said carriage is in one of its terminal positions, for rendering said manipulatable means ineffective to control said reciprocating means.

12. In a phonograph record resurfacing machine having means for supporting a record: the combination of a carriage; a settable recordengaging tool mounted onfsaidcarri'age; means for reciprocating said carriagebetween two terminal positions to cause alternating traversals of said tool relative to a supported record; means for automatically stopping said reciprocating means at the completion of' each tool-record traversal; and control means, operable at will except when said carriage is in a predetermined one of its terminal positions, for starting said reciprocating means. 1

13. In a pho-nograph'record resurfacing machine having a record support: the combination of a carriage capable of advance and return movements across said support';-driving means for said carriage; first and second control means for said driving means respectively operable to cause advance and return movements of said carriage;- and means for causing said first and second control means to-be respectively inoperable when said carriage is in predetermined positions of its path.

14. In a phonograph record resurfacing machine having means for supporting a record: the combination of a carriage; a settable recordengaging tool mounted on said carriage; a finishing-cut controlling means operable-to move said tool a predetermined distance towards the record; means operable tomove said carriage between two terminal positions to cause said tool to traverse the record in alternate directions; control means for placing said carriage-moving means in operation to cause said tool to traverse the record in one of said alternate directions; and means, controlled by said finishing-cut controlling means, for placing said carriage-moving means in operation to cause said tool to traverse the record in the other of said alternate directions. i

15. In a phonograph record resurfacing machine adapted for taking cuts from a record: the combination of a carriage movable between two terminal positions; a settable record-engaging tool mounted on said carriage; a finishingcut controlling means normally operable to move said tool a predetermined distance towards the record; and means for automatically rendering said finishing-cut controlling means inoperable when said carriage is in a predetermined one of its terminal positions.

16. In a phonograph record resurfacing machine adapted for taking cuts from a record: the combination of a carriage; a finishing-cut controlling means movable into operative and inoperative positions; a carriage-feeding means; and means, operated incidental to the movement of said finishing-cut controlling means into operative position, for placing said carriage-feeding means in operation to cause said carriage to be moved across the record.

17. In a phonograph record resurfacing machine adapted for taking cuts from a record: the combination of a resurfacing tool; a finishing-cut controlling means movable into operative and inoperative positions; means operable to move said tool back and forth across the record; means for starting said tool-moving means as an incident of moving said finishing-cut controlling means into operative position; and means, operated incidental to the completion of a traversal of the record by said tool, for returning said finishing-cut controlling means to inoperative position and for stopping said tool-moving means.

18. In a phonograph record resurfacing machine having a rotatable support for a record:

the combination of a tool-carriage; drivingmeans selectively operable to advance and to return said carriage relative to a supported record; control means for said driving means movable into start and stop positions; means for automatically mov-' ing said control means into stop position at the completion of carriage advance; means for mov-' ing said control means into start position and for simultaneously reversing said driving means to cause the return of said carriage; and means, automatically operated at the completion-of carriagereturn, for moving said control means into stop position and for rendering said driving means operable to advance said carriage.

19. In a machine adapted for resurfacing phonograph records: the combination of a tool-carriage; means for reciprocating said tool-carriage across a record to be resurfaced; a manually operable control switch having start and stop positions for rendering said reciprocating means operative and inoperative; means, operated by the movement of said tool-carriage into one end of its travel, for moving said control switch into stop position; and means, operated incidental to the movement of said control switch into stop position, for rendering said control switchfree from said tool-carriage to permit the manual movement of said control switch into start position while said tool-carriage is in said endof its travel. r

- 20. In a machine adapted for resurfacing phonograph records: the combination of a toolcarriage; means for reciprocating said toolcarriage across a record to be resurfaced; a control switch having start and stop'positions for rendering said reciprocating means operative and inoperative; means for automatically moving said control switch into stop position as said toolcarriage is moved into one end of its travel; and means operable to move said control switch into start position while said tool-carriage is in said end of its travel.

21. In a phonograph record resurfacing machine having a support for a record: the combination of a tool-carriage movable along a supported record; driving means connectable with said tool-carriage to move the latter; and a manually operable means for controlling both the starting and stopping of said driving means and the connection of the same with said toolcarriage.

22. In a phonograph record resurfacing machine having a support for a record: the combination of a tool-carriage movable along a supported record; driving means connectable with said tool-carriage to move the latter; means operable to efiect the connection of said driving means with said tool-carriage; control means for starting and stopping said driving means; and means, controlled by said control means, for disconnecting said tool-carriage from said driving means upon the stopping of the latter.

23. In a machine adapted for resurfacing phonograph records: the combination of a movable resurfacing tool; a gauge associated with said tool and movable into contact with a record to be resurfaced to determine the operative position of said tool relative to the record, said gauge and tool being arranged for relative longitudinal movement; tool-locking means; and means operable by a single manipulation thereof to move said gauge into contact with the record, to render said tool-locking means operative, and to move said gauge out of contact with the record, in the sequence named.

24. In a machine adapted for resurfacing phonograph records: the combination of a settable resurfacing too-l; a tool-setting gauge normally bearing a fixed spaced relationship to said tool; tool-locking means movable into operative position; and means operable by a single manipulation to effect, in sequence, a movement of said gauge into contact with the record to position said tool relatively thereto, a movement of said tool-locking means into operative position, and a movement of said gauge out of said fixed spaced relationship to render said gauge free of the record.

25. In a machine adapted for resurfacing phonograph records: the combination of a settable resurfacing tool; a tool-setting gauge pivotally connected with said tool; tool-locking means movable into operative position; and means operable by a single manipulation to effect, in sequence, a movement of said gauge into contact with the record, a movement of said tool-locking means into operative position, and a pivotal movement of said gauge relative to said tool and out of contact with the record.

26. In a machine adapted for resurfacing phonograph records: the combination of a resurfacing tool lockable into operative position relative to a record to be resurfaced; a gauge normally bearing a fixed relationship to said tool and movable into contact with the record to determine the operative position of said tool; means for causing said gauge to be moved out of said normal fixed relationship to said tool as an incident of locking the latter; and means, operated as an incident of moving said tool out of operative position, for restoring said gauge into normal relationship to said tool.

27. In a machine adapted for resurfacing phonograph records: the combination of a resurfacing tool movable into and out of operative position relative to a record to be resurfaced; tool-locking means; a tool-setting gauge movable into contact with the record to determine the operative position of said tool relative to the record; means for moving said gauge out of normal position relative to said tool and out of contact with the record as an incident of operating said tool-locking means; and means, operated as 1 an incident of moving said tool out of operative position, for returning said gauge into normal position relative to said tool.

28. In a machine adapted for resurfacing phonograph records: the combination of a settable resurfacing tool; a tool-setting gauge movable into contact with a record to be resurfaced to position the tool relatively thereto; means for moving said gauge relative to said tool to free the gauge from the record as an incident of tool setting; and means for automatically and temporarily restoring said gauge relative to said tool to render the gauge effective for a resetting of the tool as an incident of such resetting.

29. In a phonograph record resurfacing ma- CERTIFICATE OF CORRECTION.

Patent No. 2,209,85L July 50, 19m.

GEORGE E. FRITZINGER.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, second column, line 5, strike out the word "taken" line 62, after "rod" insert the reference numeral 25 page 10, first column, line 60, claim L after "from! insert --said--; and that the said Letters Patent should be read with this correetion therein that the same may conform to the record of the case inthe Patent Office.

Signed and sealed this 15th day of October, A. D. 1914.0.

Henry Van Arsdale, (Seal) Acting Commissioner of Patents, 

